Tips

As of today, the default storage for Docker on (K)Ubuntu 15.10 is AUFS. I want to switch it to OverlayFS. Personally, I’m still new to Docker, but I did hear that OverlayFS is better than AUFS. You can read more about OverlayFS here. Anyway, the purpose of this post is how to switch OverlayFS and avoid head-scratching. On Ubuntu 15.10 (wily), one can start/stop services either using Upstart or systemd. Since I want to get more accustomed to using systemd, I’ve been trying to use it anywhere possible. For example, here’s the command to start docker: ...

A reminder to readers, most of these blog posts are to remind me what I have done or fixed some problems. What works for me may not work for you. Most of the time, they aren’t even the best practice. Here’s a snippet of the PF firewall rule on my FreeBSD box which acts as a DNS server. Basically, the firewall opens up UDP port 53 to allow LAN access it. ...

នៅ​កន្លែង​ធ្វើ​ការ​ ខ្ញុំ​ប្រើ​ Puppet ដើម្បី​គ្រប់​គ្រង​ ម៉ាស៊ីន​ជា​ច្រើន។ ជួនកាល​ខ្ញុំ​ត្រូ​វការលុប​ម៉ាស៊ីន​ចេញ ពី Puppet master ដោយ​សារ​ម៉ាស៊ីន​នោះ​លែង​ត្រូវ​ការហើយ។ នេះ​ជា​ជំហាន​ដែល​ត្រូវ​ធ្វើ៖ ១. លុបមាស៊ីន​ ឬ ណូត​នោះ​ពី puppet dashboard ២. លុប certificate របស់ម៉ាស៊ីននោះ​ចេញពី puppet master ដោយវាយ ខំម៉ាន # puppet cert clean node123.example.com ៣. ដោយសារ​ខ្ញុំ​ប្រើ PuppetDB ខ្ញុំ​ត្រូវ​លុប​ ណូត​នោះ ចេញ​ពី PuppetDB ដែរ # puppet node deactivate node123.example.com ខ្ញុំ​សរសេរ អត្ថបទ​នេះ ដើម្បី​រំលឹក​ខ្លួន​ឯង​ពេល​ខ្ញុំ​ត្រូវ​ការ​ធ្វើ​វា​ម្តង​ទៀត។ បើ​សិន​ជា​លោកអ្នក​ មាន​សំណូម​ពរ​ ឬ​សំណួរ​ទាក់ទង​នឹង​ ការប្រើប្រាស់ Puppet អាចសួរ​ខ្ញុំ​បាន៕

After restarting my laptop which run Kubuntu 15.04 beta, it got stuck at a black screen with a message: Starting version 219. I tried to reboot it a few times, and it always displayed the same message. Fortunately, I found a solution from this page which fixed the problem. Here’s a recap on how to do it. When you see the above message, hit Ctrl + Alt + F2 Run sudo systemctl enable sddm.service -f ...

I need to setup vim-youcompleteme to get real-time completion for write Golang code. Assuming that this part has been completed first: $ cd ~/.vim/bundle $ git clone https://github.com/fatih/vim-go.github Here’s how vim-youcompleteme is installed/enabled on Ubuntu 14.04: $ sudo apt-get install vim-addon-manager vim-youcompleteme $ vam install youcompleteme Note: vam is short for the vim-addon-manager. Reference: http://blog.gopheracademy.com/vimgo-development-environment/